Fast Object Database for Java - with JPA/JDO support

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Literals in JPQL and Criteria Queries

specifying another name explicitly in the @Entity's name annotation element. Criteria Query Literals

Which API should I use - JPA or JDO?

You can use ObjectDB with either the Java Persistence API (JPA) or the Java Data Objects (JDO) API ... API, and if necessary, switch to JDO as a secondary API for special additional features that are supported only by JDO. Selecting the more popular API leads to more portable application and extends

What is the Java Persistence API (JPA)?

The Java Persistence API (JPA) is a standard API for accessing databases from within Java applications. The main advantage of JPA over JDBC (the older Java API for interacting with databases ... Persistence API (JPA). By interacting with ObjectDB using standard JPA you can keep your application

JPA Metamodel API

The JPA Metamodel API provides the ability to examine the persistent object model and retrieve ... Metamodel API is Metamodel. It can be obtained either by the EntityManagerFactory's getMetamodel method or ... . Type Interface Hierarchy Types are represented in the Metamodel API by descendant interfaces

JPA Metamodel API Attributes

The following interfaces and enum types represent attributes (persistent fields and properties) in the JPA Metamodel API: See the Metamodel Attribute Interface Hierarchy section for more details and examples.

JPA Metamodel API Types

The following interfaces and enum represent types in the JPA Metamodel API: See the Metamodel Type Interface Hierarchy section for more details and examples.

ObjectDB APIs

All about ObjectDB APIs in Java/JPA database - explanations, examples, references, links and related information.

JPA Queries

. "SELECT c FROM Country"). Criteria Query API Building dynamic queries with structure that is known ... concatenating JPQL strings into a valid complete JPQL query. JPA 2 introduced the JPA Criteria Query API, as ... instance. Building a dynamic query using the criteria API is managed by the CriteriaQuery interface


how to define queries using the criteria API in Chapter 4 of the ObjectDB/JPA manual. AbstractQuerycriteria Interface CriteriaQuery Superinterfaces: AbstractQuerycriteria query object created as well as the argument to the multiselect method


this API in order to work around the fact that Java generics are not compatible with varags. Since: JPA 2.0 Learn how to define queries using the criteria API in Chapter 4 of the ObjectDB/JPA manual ... javax.persistence.criteria Interface CriteriaBuilder Used to construct criteria queries, compound

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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